1 | /* |
2 | * Copyright (c) 2019 Apple Computer, Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | |
29 | extern "C" { |
30 | #include <mach/task.h> |
31 | #include <pexpert/pexpert.h> |
32 | }; |
33 | |
34 | #include <machine/machine_routines.h> |
35 | #include <IOKit/IOPlatformExpert.h> |
36 | #include <IOKit/IOService.h> |
37 | #include <IOKit/PassthruInterruptController.h> |
38 | |
39 | #define super IOInterruptController |
40 | OSDefineMetaClassAndStructors(PassthruInterruptController, IOInterruptController); |
41 | |
42 | bool |
43 | PassthruInterruptController::init(void) |
44 | { |
45 | if (!super::init() || |
46 | !this->setProperty(aKey: gPlatformInterruptControllerName, anObject: kOSBooleanTrue) || |
47 | !this->attach(provider: getPlatform())) { |
48 | return false; |
49 | } |
50 | registerService(); |
51 | if (getPlatform()->registerInterruptController(name: gPlatformInterruptControllerName, interruptController: this) != kIOReturnSuccess) { |
52 | return false; |
53 | } |
54 | if (semaphore_create(task: kernel_task, semaphore: &child_sentinel, SYNC_POLICY_FIFO, value: 0) != KERN_SUCCESS) { |
55 | return false; |
56 | } |
57 | return true; |
58 | } |
59 | |
60 | void |
61 | PassthruInterruptController::setCPUInterruptProperties(IOService *service) |
62 | { |
63 | if ((service->getProperty(aKey: gIOInterruptControllersKey) != NULL) && |
64 | (service->getProperty(aKey: gIOInterruptSpecifiersKey) != NULL)) { |
65 | return; |
66 | } |
67 | |
68 | long zero = 0; |
69 | OSArray *specifier = OSArray::withCapacity(capacity: 1); |
70 | OSData *tmpData = OSData::withValue(value: zero); |
71 | specifier->setObject(tmpData); |
72 | tmpData->release(); |
73 | service->setProperty(aKey: gIOInterruptSpecifiersKey, anObject: specifier); |
74 | specifier->release(); |
75 | |
76 | OSArray *controller = OSArray::withCapacity(capacity: 1); |
77 | controller->setObject(gPlatformInterruptControllerName); |
78 | service->setProperty(aKey: gIOInterruptControllersKey, anObject: controller); |
79 | controller->release(); |
80 | } |
81 | |
82 | IOReturn |
83 | PassthruInterruptController::registerInterrupt(IOService *nub, |
84 | int source, |
85 | void *target, |
86 | IOInterruptHandler handler, |
87 | void *refCon) |
88 | { |
89 | child_handler = handler; |
90 | child_nub = nub; |
91 | child_target = target; |
92 | child_refCon = refCon; |
93 | |
94 | // Wake up waitForChildController() to tell it that AIC is registered |
95 | semaphore_signal(semaphore: child_sentinel); |
96 | return kIOReturnSuccess; |
97 | } |
98 | |
99 | void * |
100 | PassthruInterruptController::waitForChildController(void) |
101 | { |
102 | // Block if child controller isn't registered yet. Assumes that this |
103 | // is only called from one place. |
104 | semaphore_wait(semaphore: child_sentinel); |
105 | |
106 | // NOTE: Assumes that AppleInterruptController passes |this| as the target argument. |
107 | return child_target; |
108 | } |
109 | |
110 | IOReturn |
111 | PassthruInterruptController::getInterruptType(IOService */*nub*/, |
112 | int /*source*/, |
113 | int *interruptType) |
114 | { |
115 | if (interruptType == NULL) { |
116 | return kIOReturnBadArgument; |
117 | } |
118 | |
119 | *interruptType = kIOInterruptTypeLevel; |
120 | |
121 | return kIOReturnSuccess; |
122 | } |
123 | |
124 | IOReturn |
125 | PassthruInterruptController::enableInterrupt(IOService */*nub*/, |
126 | int /*source*/) |
127 | { |
128 | return kIOReturnSuccess; |
129 | } |
130 | |
131 | IOReturn |
132 | PassthruInterruptController::disableInterrupt(IOService */*nub*/, |
133 | int /*source*/) |
134 | { |
135 | return kIOReturnSuccess; |
136 | } |
137 | |
138 | IOReturn |
139 | PassthruInterruptController::causeInterrupt(IOService */*nub*/, |
140 | int /*source*/) |
141 | { |
142 | ml_cause_interrupt(); |
143 | return kIOReturnSuccess; |
144 | } |
145 | |
146 | IOReturn |
147 | PassthruInterruptController::handleInterrupt(void */*refCon*/, |
148 | IOService */*nub*/, |
149 | int source) |
150 | { |
151 | panic("handleInterrupt shouldn't be invoked directly" ); |
152 | } |
153 | |
154 | void |
155 | PassthruInterruptController::externalInterrupt(void) |
156 | { |
157 | child_handler(child_target, child_refCon, child_nub, 0); |
158 | } |
159 | |